Removing files ending with a ~ in the git checkout hook

While editing files, some editors create temporary `~' files that can cause
problems in metastore's ability to delete their host directory if its not
on the other branch. With this commit, a `find' call was added to the post
checkout Git hook to remove such temporary files before metastore is
called.

Also, some comments were added to both git hooks to make them easier to
understand for a beginner.

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